Mastodawn

100-year flood (Hydrology 💧)

A 100-year flood is a flood event that has on average a 1 in 100 chance of being equaled or exceeded in any given year. The 100-year flood is also referred to as the 1% flood. For coastal or lake flooding, the 100-year flood is generally expressed as a flood elevation or depth, and may include wave effects. For river systems, ...